摘要
通过对电网电压中的高次谐波进行分析,其对并网逆变器功率波动与电流谐波影响较大。首先分析高次谐波电压对电流和功率产生的影响,进而提出一种电流与功率协同控制策略,设计级联低通滤波器滤除指令电流中的高次谐波分量,采用加权思想实现电流/功率协同控制,根据系统控制频率设计准比例谐振(QPR)控制器实现并网电流无谐波。避免了锁相环对系统的干扰,不必提取正负序变量,简化了控制结构。最后实验验证了所提控制策略的有效性。
The high-order harmonics in the grid voltage had a greater impact on the power fluctuations and current harmonics of the grid-connected inverter.Firstly,the impacts of high-order harmonic voltage on current and power are analyzed,then a current/power cooperative control strategy is proposed.A cascaded low-pass filter is designed to filter out the high-order harmonic components in the command current.A weighted idea is adopted to realize current/power coordinated control.According to the system control frequency,a quasi proportional resonance(QPR)controller is designed to realize grid-connected current without harmonics.The system avoids the interference of the phase-locked loop,extracts positive and negative sequence variables,and simplifies the control structure.Finally,the experiment verifies the effectiveness of the proposed control strategy.
作者
史丽萍
祁晓雨
李俊杰
韩丽
SHI Li-ping;QI Xiao-yu;LI Jun-jie;HAN Li(China University of Mining and Technology,Xuzhou 221008,China)
出处
《电力电子技术》
CSCD
北大核心
2021年第3期68-70,共3页
Power Electronics
基金
国家自然科学基金(61703404)。
关键词
并网逆变器
高次谐波电压
协调控制
grid-connected inverter
high-order harmonic voltage
coordinative control
